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Tips for Troubleshooting Your Furnace

Last updated 7 years ago

Furnaces always seem to stop working right when we need them—during the few cold months of San Antonio having an HVAC repairman come out can be expensive, and it may even be a couple days before they’re able to get to your house.  For those times, it’s best to know how to troubleshoot your furnace yourself.

If your furnace isn’t running at all, then there are a few basic things to check:

  • Be sure the furnace is getting power.  There could be a blown fuse or a tripped breaker.  Your furnace may also have a separate power switch that needs to be turned on.
  • The motor may be overloaded.  Wait 30 minutes and press the reset button.
  • You might need to re-light the pilot.  Also be sure the furnace is getting gas by checking to see if the gas valve is fully open.
  • If none of this works you’ll probably have to call your San Antonio A/C repair service for maintenance.

If your furnace is running but not giving enough heat, then here are a few things to check:

  • Check the filter.  Heating and air conditioning filters need to be replaced or cleaned once a month when they’re being used regularly.
  • Your furnace blower might be clogged.  Unclogging it can be a bit of a pain depending on your furnace, but it’s a relatively simple process. 
  • Check the registers and balance of your system.  Close registers to rooms that aren’t used regularly and be sure the rooms you’re using are open and pointed in the proper direction.
  • The blower belt to your furnace may be loose or broken.  Adjust the belt so it’s snug or replace it if it’s broken. 

If you’re still having problems, then it’s time to call John Wayne Heating and Air in San Antonio, Texas.  Even if it can’t be fixed, we can get you set up with a new furnace.  Don’t be left in the cold—call us at (210) 591-7847  for HVAC help you can count on.



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